<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<hr>
<h4>计算机</h4>
<hr>
<input type="text">
<table border="1" cellpadding="10" cellspacing="10">
    <tr>
        <td >0</td>
        <td>1</td>
        <td>2</td>
    </tr>
    <tr>
        <td>3</td>
        <td>4</td>
        <td>5</td>
    </tr>
    <tr>
        <td>6</td>
        <td>7</td>
        <td>8</td>
    </tr>
    <tr>
        <td>9</td>
        <td>.</td>
        <td>退格</td>
    </tr>
</table>

</body>
</html>